Free World Bit from GLD

[clandest]

Use the public IP, if available, to obtain the country code from the GLD database. Check the country code against a hard-coded list of non-Free-World countries to see whether we're in the Free World or not, and add that information to our Node Record in the Neighborhood.

[czarte]

Roadmap:

1. Introduce new struct NodeLocation { id: u8, country: String, free_world: bool }

   pub struct NodeLocation { 
       pub(crate) country_code: String, 
       pub(crate) free_world_bit: bool
   }
   

2. Introduce new function get_node_location() to obtain country_code and free_world_bit
3. Implement country_code for NodeRecordInner_0v1 for Gossip purpose